Elevator



(N0 Modl.)

' H. CHANDLER. ELEVATOR.

N. FETERS. mw-um u m. 'Wnshingion. n. c

NITED S'rrrrns ATENT rrion.

HENRY CHANDLER, OF BUFFALO, NEW YORK.

ELEVATO RI SPECIFICATION forming part of Letters Patent No. 296,315, dated April 8, 1884.

- Application filed July 17,1883. (No rnodcl.)

To all whom it may concern.-

Be it known that I, HENRY CHANDLER, of

the city of Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Elevators, of which the following is a specification.

This invention relates to an improvement in that class of elevators which are employed for raising passengers, merchandise, &c., in hotels, warehouses, and other buildings; and my invention has the object to construct the hoisting mechanism in such manner that the movable platform and the load placed on the same can be counterbalanced by a weight equal to a fraction of theweight of the platform and load, and so that the counter-balance will not be dis turbed and the platform be sustained in any position in which it may be placed when the load is removed from the platform, or when varying loads are placed upon the platform.

My invention also has the object to provide a safetycatch which will arrest the downward movement of the platform when the hoisting rope breaks, and which is automatically applied by the counterbalancing-weight.

My invention consists of the improvements which will be hereinafter fully set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 represents an elevation of an elevator provided with my improvements. Fig. 2 represents a top plan view of the same; Fig. 3, a cross-section in line a: as, Fig. 1. Fig. 4 is an end elevation of the platform and safety-catch. Fig. 5 is a horizontal section, on an enlarged scale, in line 9 3 Fig. 1. Fig. 6 is a side elevation of one of the rollers and arms shown in Fig. 5.

Like letters of reference refer to like parts in the several figures.

A. represents the movable platform of the elevator, and B-the cross-head to which the platform is attached by uprights a.

0 represents the vertical guide-posts between which the elevator platform or cage moves. 1) represents a pulley attached to the cross-head B by a bifurcated bearing, (1, and E represents the endless hoisting rope or cable running around the pulley D.

F F are guide-pulleys arranged above the elevator cage or platform, and supported on a cross-frame, f, secured to the upper ends of the vertical guide-posts, or in any other suitable manner.

G G are guide-pulleys arranged below the elevator cage or platform and supported in the base-frame g, on which the guide-posts 0 rest, or in any other suitable manner.

H H are two-differential pulleys, or pulleys of different diameters secured or cast together side by side and supported in the upper crossframe, f, or about in line with the upper guide-pulleys, F F. The diiferential pulleys H H are mounted loosely upon a roller, I,

which is smaller in diameter than the central opening, 2', formed in both pulleys, so that the pulleys, when resting on the roller I, are aring-rope E runs from the pulley D upwardly. to the guide-pulley F; thence horizontally to the small differential pulley H; thence downwardly past the guidepulley K to and around the pulley M on the counterbalancing-weight; thence upwardly and around the large differential pulley H; thence downwardly to the lower guide-pulley, G; thence horizontally to the guide-pulley G,- thence upwardly to the guide-pulley F, and thence back to the.

pulley D, or in an opposite direction. The motive-power may be applied to either of the pulleys aroundwhich the endless rope E passes,

or it may be applied directly to the rope, as may be preferred. the direction of the arrow in Fig. 1, the cage or platform is raised, and upon moving the rope in the opposite direction the platform is lowered. The counter-balance acts upon the cage through the medium of the differential pulleys H H, and is proportioned to theaverage load carried on the platform. The leverage on which the counter-balance works,

Upon moving the rope in.

by reason of the difference between the diameters of the differential pulleys H H, is further increased by the fact that these wheels are not supported at their centers, but on the themselves on the roller in accordance with the proportion between the load and the counter-balance until the leverage on which the counter-balance works balances the load. A comparatively light counterbalance is thereby enabled to sustain the elevator-cage and its load, and relieve the actuating-engine from the pressure of the same.

n represents wheels or rollers having serrated or roughened faces and attached to the outer ends of arms N, which are pivoted to one of the uprights a of the elevator-cage by a shaft, 0, turning in bearings 0. The arms N extend outwardly on both sides of the uprights a and the adjacent guide-post c, and the rollers n are arranged on the rear or outer side of the guide-post, as clearly represented in Fig. 5. Two sets of these rollers are preferably employed and connected by a rod, 1), so as to be moved simultaneously.

P representsa lever pivoted to the elevatorcage, preferably to the upper bearing, (1, as

shown in Fig. 1, and having its end connected by a rod, 10, with the upper set of rollers, 01..

q is the actuating-rope attached to the'lever 1?, and running over guide-pulleys Q Q to the counter-balance L. When the hoisting-rope E is in its normal condition, the rope q is slack, and the arms N are in a horizontal position, in which the rollers 11. do not bear against the guide-post O, as represented in Figs. 1 and 5. The upright a is provided with a stop, r, on which one of the arms N rests in this position, whereby all of the rollers 12 are held awayfrom the guide-post. If the hoisting-rope E should break,the counter-balance L drops, tightening the rope q, raising the outer ends of the arms N, and pressing the rollers n tightly against the rear side of the guide-post 0, whereby the cage is clamped against this post and prevented from descending. The cage is by this device secured before it has had time to fall any considerable distance after the breakage occurred, whereby the operation of the safety device-is rendered more certain, and the strain eration after the cage has acquired a certain excessive speed'. Any other suitable or wellknown catch device may be substituted for the rollers n, if desired.

I claim as my invention- 1. The combination, with the elevator platform or cage, of an endless hoisting-rope, a counterbalancing-Weight provided with a pulley, differential pulleys, and guide -pulleys around which the hoisting-r0pe runs, substantially as set forth.

'2. In a hoisting-machine, the combination, with differential pulleys, of an eccentric support upon which the pulleys can adjust themselves, substantially as set forth.

3. In a hoisting-machine, the combination, with differential pulleys mounted on an eccentric support, of an endless hoisting-rope and a counterbalancingweight, substantially as set forth.

4.. The combination, with the differential pulleys H-H, having a central opening, 11, of a supporting-roller, I, made smaller in diameter than the opening 43, substantially as set forth.

5. The combination, withthe elevator platform or cage provided with a pulley, D, of an endless hoisting-rope, E, guide-pulleys F F and G G, arranged, respectively, above and below said platform, differential pulleys H H, and a counterbalancing-weight, L, provided with a pulley, M, substantially as set forth.

6. The combination, with'an elevator platform or cage,of a safety-catch attached thereto, an endless hoisting-rope, a counterbalancingweight having a pulley around which the endless hoisting-rope passes, and a rope or chain, whereby the counterbalancing-weight is connected with the safety-catch, substantially'as and for the purpose set forth.

7. The combination, with an elevator platform or cage, of friction-rollers n, mounted on levers N, pivoted to the cage or platform, an endless hoisting-rope, and a'counterbalancingweight suspended by'the same, and connected by a slack rope with the lever N, substantiallyas set forth. I

HENRY CHANDLER.

WVitnesses:

OHAs. F. GEYER, JNO. J. BONNER. 

